KR101010501B1 - 초퍼안정화된 증폭기 및 초퍼안정화된 증폭기를 동작시키는 방법 - Google Patents
초퍼안정화된 증폭기 및 초퍼안정화된 증폭기를 동작시키는 방법 Download PDFInfo
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- KR101010501B1 KR101010501B1 KR1020087020774A KR20087020774A KR101010501B1 KR 101010501 B1 KR101010501 B1 KR 101010501B1 KR 1020087020774 A KR1020087020774 A KR 1020087020774A KR 20087020774 A KR20087020774 A KR 20087020774A KR 101010501 B1 KR101010501 B1 KR 101010501B1
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- Prior art keywords
- notch filter
- output
- signal
- input
- chopper
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45479—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection
- H03F3/45928—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit
- H03F3/45968—Differential amplifiers with semiconductor devices only characterised by the way of common mode signal rejection using IC blocks as the active amplifying circuit by offset reduction
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/005—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements using switched capacitors, e.g. dynamic amplifiers; using switched capacitors as resistors in differential amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/38—Dc amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers
- H03F3/387—Dc amplifiers with modulator at input and demodulator at output; Modulators or demodulators specially adapted for use in such amplifiers with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H19/00—Networks using time-varying elements, e.g. N-path filters
- H03H19/004—Switched capacitor networks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/261—Amplifier which being suitable for instrumentation applications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/459—Ripple reduction circuitry being used in an amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45212—Indexing scheme relating to differential amplifiers the differential amplifier being designed to have a reduced offset
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/04—Frequency selective two-port networks
- H03H2011/0488—Notch or bandstop filters
Abstract
Description
Claims (14)
- 초퍼-안정화된 증폭기(chopper-stabilized amplifier)로서,(a) 제1 연산 트랜스컨덕턴스 증폭기(operational transconductance amplifier);(b) 상기 제1 연산 트랜스컨덕턴스 증폭기의 입력에 결합되며, 입력 신호를 초핑(chopping)하고 상기 초핑된 입력 신호를 상기 제1 연산 트랜스컨덕턴스 증폭기의 입력에 인가하기 위한 제1 초퍼 회로(chopper circuitry) 및, 상기 제1 연산 트랜스컨덕턴스 증폭기의 출력에 결합되며, 상기 제1 연산 트랜스컨덕턴스 증폭기에 의해 생성되는 출력 신호를 초핑하기 위한 제2 초퍼 회로; 및(c) 입력이 상기 제2 초퍼 회로의 출력에 결합되어 있고, 상기 제2 초퍼 회로에 의해 생성되는 초핑된 출력 신호에 대한 통합 및 전달 기능(integrate and transfer function)을 수행하며, 상기 제2 초퍼 회로의 초핑 주파수와 동기하여 동작하여, 노치 필터링(notch filter)하지 않을 경우 상기 제2 초퍼 회로의 출력에서 발생할 수 있는 리플 전압들(ripple voltages)을 노치 필터링함으로써 상기 제2 초퍼 회로에 의해 생성되는 초핑된 출력 신호를 필터링하는 스위치된 캐패시터 노치 필터(switched capacitor notch filter)를 포함하고,상기 노치 필터의 입력은 제1 및 제2 입력 단자들(terminals)을 포함하고, 상기 노치 필터는 제1 및 제2 출력 단자들을 포함하며, 상기 노치 필터는,i. 상기 제1 입력 단자와 제1 도체(conductor) 사이에서 결합되는 제1 스위치, 상기 제1 도체와 상기 제1 출력 단자 사이에서 결합되는 제2 스위치, 상기 제2 입력 단자와 제2 도체 사이에서 결합되는 제3 스위치, 및 상기 제2 도체와 상기 제2 출력 단자 사이에서 결합되는 제4 스위치를 포함하는 제1 경로(path),ii. 상기 제1 입력 단자와 제3 도체 사이에서 결합되는 제5 스위치, 상기 제3 도체와 상기 제1 출력 단자 사이에서 결합되는 제6 스위치, 상기 제2 입력 단자와 제4 도체 사이에서 결합되는 제7 스위치, 및 상기 제4 도체와 상기 제2 출력 단자 사이에서 결합되는 제8 스위치를 포함하는 제2 경로, 및,iii. 상기 제1 도체와 상기 제2 도체 사이에서 결합되는 제1 통합 및 전달 캐패시터(integrate and transfer capacitor) 및, 상기 제3 도체와 상기 제4 도체 사이에서 결합되는 제2 통합 및 전달 캐패시터를 포함하는 초퍼-안정화된 증폭기.
- 제1항에 있어서, 입력이 상기 노치 필터의 출력에 결합되는 제2 연산 트랜스 컨덕턴스 증폭기를 포함하는 초퍼-안정화된 증폭기.
- 삭제
- 제2항에 있어서, 상기 제1, 제3, 제6 및 제8 스위치들은 제1 클럭 신호에 의해 제어되며, 상기 제2, 제4, 제5 및 제7 스위치들은 제2 클럭 신호에 의해 제어되며, 상기 제1 및 제2 클럭 신호들은 서로 위상이 어긋나 있는(the first and second clock signals are out of phase with each other) 초퍼-안정화된 증폭기.
- 제4항에 있어서, 상기 제1 및 상기 제2 클럭 신호들의 천이들(transitions)은 상기 제2 초퍼 회로의 초핑 신호의 천이들에 대하여 시프트(shift)되는 초퍼-안정화된 증폭기.
- 제5항에 있어서, 상기 제1 및 상기 제2 클럭 신호들의 천이들은 상기 제2 초퍼 회로의 초핑 신호의 천이들에 대하여 90˚만큼 시프트되는 초퍼-안정화된 증폭기.
- 제1항 또는 제2항에 있어서, 상기 노치 필터는, 상기 제2 초퍼 회로의 초핑 신호와 동기하여 동작하여, 상기 노치 필터의 입력에서의 전하가 상기 제1 클럭 신호 동안 상기 제1 통합 및 전달 캐패시터 상에서 그리고 상기 제2 클럭 신호 동안 상기 제2 통합 및 전달 캐패시터 상에서 통합되게 하고, 상기 제1 통합 및 전달 캐패시터 상에서 유지되는(held) 전하가 상기 제2 클럭 신호 동안 상기 노치 필터의 출력으로 전달되게 하고, 상기 제2 통합 및 전달 캐패시터 상에서 유지되는 전하로 하여금 상기 제1 클럭 신호 동안 상기 노치 필터의 출력으로 전달되게 하는 초퍼-안정화된 증폭기.
- 제2항에 있어서, 입력이 상기 제2 연산 트랜스컨덕턴스 증폭기의 출력에 결합되는 제3 연산 트랜스컨덕턴스 증폭기와, 입력이 상기 입력 신호를 수신하도록 결합되고 출력이 상기 제2 연산 트랜스컨덕턴스 증폭기의 출력에 결합되는 제4 연산 트랜스컨덕턴스 증폭기를 포함하는 초퍼-안정화된 증폭기.
- 제8항에 있어서, 상기 노치 필터의 입력 측에 그리고 상기 노치 필터의 출력 측에 결합되는 보상 캐패시턴스(compensation capacitance)를 포함하는 초퍼-안정화된 증폭기.
- 제9항에 있어서, 상기 노치 필터의 입력 측에 결합되는 보상 캐패시턴스의 양은, 상기 노치 필터의 출력 측에 결합되는 보상 캐패시턴스의 양보다 실질적으로 더 커서, 상기 초퍼-안정화된 증폭기에서의 안정성과 신속한 신호 세틀링(signal settling)을 제공하는 초퍼-안정화된 증폭기.
- 제1 연산 트랜스컨덕턴스 증폭기를 포함하는 초퍼-안정화된 증폭기를 동작시키는 방법으로서,(a) 입력 신호를 초핑하고, 상기 초핑된 입력 신호를 상기 제1 연산 트랜스컨덕턴스 증폭기의 입력에 인가하고, 상기 제1 연산 트랜스컨덕턴스 증폭기에 의해 생성되는 출력 신호를 초핑 주파수에서 초핑하여 초핑된 출력 신호를 생성하는 단계; 및(b) 노치 필터링하지 않을 경우 상기 초핑된 출력 신호에서 발생할 수 있는 리플 전압들을 노치 필터링하기 위해, 초핑 주파수와 동기하여 제2 초퍼 회로에 의해 생성되는 초핑된 출력 신호에 대해 통합 및 전달 기능을 수행함으로써, 입력이 상기 초핑된 출력 신호를 수신하도록 결합되어 있는 스위치된 캐패시터 노치 필터를 동작시키는 단계를 포함하고,상기 스위치된 캐패시터 노치 필터는 제1 스위치 신호 경로 및 제2 스위치 신호 경로를 포함하고, 상기 제1 스위치 신호 경로는 제1 통합 및 전달 캐패시터를 포함하고, 상기 제2 스위치 신호 경로는 제2 통합 및 전달 캐패시터를 포함하며,상기 스위치된 캐패시터 노치 필터를 동작시키는 단계는노치 필터 스위칭 사이클의 절반 동안, 상기 제1 스위치 신호 경로는 상기 제1 통합 및 전달 캐패시터를 이용하여 상기 제1 연산 트랜스컨덕턴스 증폭기로부터의 증폭되고 초핑된 신호를 통합하는 단계,동일한 간격 동안, 상기 제2 스위치 신호 경로는 상기 제2 통합 및 전달 캐패시터에서 제2 연산 트랜스컨덕턴스 증폭기로 증폭된 신호를 전달하는 단계, 및상기 스위치된 캐패시터 노치 필터의 동작 사이클의 다음 절반 동안, 상기 두 개의 신호 경로의 통합 및 전달 기능이 역으로 되는 단계를 포함하는 초퍼-안정화된 증폭기 동작 방법.
- 제11항에 있어서, 상기 스위치된 캐패시터 노치 필터의 스위칭은, 상기 제1 연산 트랜스컨덕턴스 증폭기에 의해 생성되는 출력 신호의 초핑과 90˚ 만큼 위상이 어긋나 있는(switching of the switched capacitor notch filter is 90 degrees out of phase with the chopping of the output signal produced by the first operational transconductance amplifier) 초퍼-안정화된 증폭기 동작 방법.
- 제11항 또는 제12항에 있어서, 신호 전하의 손실 없이 상기 통합 및 전달 기능을 수행하는 단계를 포함하는 초퍼-안정화된 증폭기 동작 방법.
- 삭제
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US11/340,223 US7292095B2 (en) | 2006-01-26 | 2006-01-26 | Notch filter for ripple reduction in chopper stabilized amplifiers |
US11/340,223 | 2006-01-26 |
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KR20080091376A KR20080091376A (ko) | 2008-10-10 |
KR101010501B1 true KR101010501B1 (ko) | 2011-01-21 |
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US20070170981A1 (en) | 2007-07-26 |
EP1982411A4 (en) | 2009-05-13 |
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EP1982411A2 (en) | 2008-10-22 |
CN101536306A (zh) | 2009-09-16 |
CN101536306B (zh) | 2012-03-28 |
US7292095B2 (en) | 2007-11-06 |
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